Make View#setBackgroundDrawable a no-op if setting the same background.
Make View#setBackgroundDrawable a no-op if setting the same background.

Change-Id: Idd3e0ae80609557d82a5564daa1cfb0abca42ded

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base